Radix (Radix) obliquata (Martens, 1864)

(Table 4; fig. 5 B)

Regional distribution. ThiS SpecieS inhabitS large mountain lakeS of Central ASia and it haS SeVeral timeS been regiStered from Mongolia (Möllerdorff, 1901; Yen, 1939; IzzatullaeV & StarobogatoV 1985; KrugloV, 2005). We report R. obliquata from a few WeStern Mongolia lakeS (Khar Nuur, Khoit Dalai Nuur). AlSo, a large Sample of ShellS of thiS SpecieS (ZIN) waS collected from an unnamed lake in the UVS Nuur depreSSion (See fig. 5 B).

Extra-limital distribution. The type locality of Radix obliquata iS ISSyk-Kul’ Lake, KyrgyzStan (VinarSki 2016a). Yen (1942) alSo mentioned it from lakeS of Tibet (aS R. auricularia obliquata). It iS alSo known from TuVa (ProzoroVa & Sharyi-Ool 1999).

Morphology. R. obliquata iS characterized by large auriculate Shell with Very wide aperture, Strongly conVex whorlS and prominently concaVe tangent line. The columellar depreSSion iS uSually Very prominent.